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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>SPECIAL METHODS OF IMPROVING AGGREGATES USED IN ROAD CONSTRUCTION</title>
      <link>https://trid.trb.org/View/1068407</link>
      <description><![CDATA[TRANSLATION LCPC N. 76 T 5, FROM BULGARIAN INTO FRENCH.  THE MOST COMMON METHODS USED TO CLASSIFY STONE MATERIALS AS A FUNCTION OF THEIR HARDNESS ARE DESCRIBED.  FOR CLASSIFYING THE MATERIAL, CLASSIFIERS WITH A FLAT CYLINDRICAL SURFACE WERE DEVELOPED.  THE PRINCIPLE OF OPERATION OF THE CYLINDRICAL DRUM CLASSIFIER IS BASED ON THE FOLLOWING PHYSICO-MECHANICAL LAWS: A METAL CYLINDER OF KNOWN DIAMETER TURNS AT A CONSTANT ANGULAR VELOCITY IN A CLOCKWISE DIRECTION.  THE FRACTIONS OF STONE MATERIAL REACH THE DRUM AT A CERTAIN ANGLE.  AT THE MOMENT OF CONTACT, FRICTION CAUSES REFLECTION AND TANGENTIAL SPEED TO OCCUR. AS A RESULT, THE PARTICLES REBOUND WITH A DIFFERENT VELOCITY AND AT A DIFFERENT ANGLE.  IN THIS FASHION THE STONE PARTICLES COLLECT TOGETHER AT A DISTANCE FROM THE DRUM, WHICH VARIES AS A FUNCTION  OF THEIR STRENGTH CHARACTERISTICS. THE PRECISION OF THE DISTRIBUTION OF THE MATERIAL IS INFLUENCED BY THE TEMPERATURE, DEGREE OF DIRTINESS AND DEGREE OF MOISTURE CONTENT OF THE MATERIAL.  THE TECHNICAL CHARACTERISTICS OF  OPERATION OF THE PRINCIPAL TYPES OF CLASSIFIERS ARE GIVEN.  CLASSIFIER TYPE DBK-20, DEALING WITH SEPARATION OF FRACTIONS OF 5 - 10 MM, AN OUTPUT OF 20 CU.M./HR.]]></description>
      <pubDate>Sun, 21 Nov 2010 11:10:02 GMT</pubDate>
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      <title>COHESION OF BITUMENS</title>
      <link>https://trid.trb.org/View/25532</link>
      <description><![CDATA[Existing methods of measuring bitumen cohesion are described.  Particular reference is made to Professor Ewers' method of determining cohesion, and results obtained using this method are given.]]></description>
      <pubDate>Wed, 26 Mar 1975 00:00:00 GMT</pubDate>
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      <title>A CORRELATION BETWEEN THE WATER SATURATION AND THE SWELLING OF ASPHALTIC CONCRETE</title>
      <link>https://trid.trb.org/View/25535</link>
      <description><![CDATA[Mathematical statistical methods were used to establish relations between water saturation and swelling, and the results are expressed in the form of equations, in accordance with the least square method.  It is concluded from the relations determined that the water saturation increases with the swelling.]]></description>
      <pubDate>Wed, 26 Mar 1975 00:00:00 GMT</pubDate>
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      <title>STATIC TEST OF THE SUPERSTRUCTURE OF THE "ASPARUCH" BRIDGE</title>
      <link>https://trid.trb.org/View/133416</link>
      <description><![CDATA[A description is given of the static testing of Bulgaria's largest bridge, which has a special superstructure of assembled beams and a continuous concrete slab.  The surfaces which influence the stresses in the beams and in the associated slab are determined.  Results are used in design. /TRRL/]]></description>
      <pubDate>Wed, 20 Nov 1974 00:00:00 GMT</pubDate>
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